Many of us enjoy the videos posted on youtube, but is there any reason to view them at work?
Check out the youtube website and search for "Civil 3D". Today, I received 28 results. (If you put "" around the phrase, it will remove videos about the civil war or civil disputes.) The subjects range from CUI, styles, surfaces, corridors, render.
You can also try searches for other software such as "AutoCAD", "AutoCAD 2008", "Excel", etc.